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arXiv 0906.4696hep-ph
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BMSSM对宇宙学的影响

BMSSM Implications for Cosmology

Nicolas Bernal, Kfir Blum, Marta Losada, Yosef Nir

摘要:

在MSSM中加入Higgs场的不可重正化项,改善了MSSM的小层次问题。我们详细分析了BMSSM影响的两个主要宇宙学问题:暗物质和重子生成。的LSP的遗物丰度是一致的WMAP和对撞机的限制的区域被确定,显示散装区域和其他以前被排除的区域现在被允许。要求真空稳定性限制了允许的区域。基于两圈有限温度有效势分析,我们证明了在MSSM与LEP Higgs质量束缚不相容的区域,包括参数\tan β \lsim 5,m_{ \tilde{t}_{1} } > m_t,m_Q << TeV,电弱相变可以是充分的一级相变.

英文摘要:

The addition of non-renormalizable terms involving the Higgs fields to the MSSM (BMSSM) ameliorates the little hierarchy problem of the MSSM. We analyze in detail the two main cosmological issues affected by the BMSSM: dark matter and baryogenesis. The regions for which the relic abundance of the LSP is consistent with WMAP and collider constraints are identified, showing that the bulk region and other previously excluded regions are now permitted. Requiring vacuum stability limits the allowed regions. Based on a two-loop finite temperature effective potential analysis, we show that the electroweak phase transition can be sufficiently first order in regions that for the MSSM are incompatible with the LEP Higgs mass bound, including parameter values of \tanβ\lsim 5, m_{\tilde{t}_{1}} > m_t, m_Q << TeV.

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